I agree, it definitely would be add a load of gravitas to the movie. The only thing is I think that Cap has the potential, if nailed the way RDJ nailed Iron Man, to be an extremely memorable character. The WWII guy triumphing and leading by example in these troubled times. I think it would be a huge mistake for Marvel to squander such a special hero let alone bucketloads of cash. Believe me if they continue to make Avengers movies people will be going to see Cap like they do Wolverine in Xmen.